3 sentences

1. 对手试图阻挠这项协议的签署。

   duì​shǒu shì​tú zǔ​náo zhè xiàng xié​yì de qiān​shǔ.

   Opponents tried to block the signing of the agreement.

   Source: Dong Chinese Dictionary

2. 他表面上答应了，却在暗地里阻挠计划的实施。

   tā biǎo​miàn shàng dā​ying le, què zài àn​dì​li zǔ​náo jì​huà de shí​shī.

   He agreed on the surface, but secretly obstructed the implementation of the plan.

   Source: Dong Chinese Dictionary

3. 他试图通过曲线迂回的策略，巧妙地避开了对手的阻挠。

   tā shì​tú tōng​guò qū​xiàn yū​huí de cè​lüè, qiǎo​miào de bì​kāi le duì​shǒu de zǔ​náo.

   He tried to cleverly bypass his opponent's interference through a roundabout strategy.

   Source: Dong Chinese Dictionary